please note this is a guide only. Spanish clothing is smaller made so we recommend choosing a size bigger. Brands Mintini, Blues Baby & Caramelo Kids there is no need to choose a size bigger 
1M = 0-1

3M= 0-3

6M= 3-6

9M= 6-9 ( if no 9m then 12m= 6-12M)

12M= 9-12

18M= 12-18

24M= 18-24

36M= 2-3y

4Year= 3-4Y

5Year= 4-5y

6Year= 5-6y